Most surface pro 3s have a haswell ULV with HD4400 which CANNOT display 4k@60hz over SST. This is due to their low pixelclock.
Hmm, so it will do 4K @ 60 Hz only via MST? I'm surprised that's true since the total bandwidth required from the GPU is the same regardless of whether it's being sent via MST or SST, and of course even in MST mode the same single GPU is doing all of the work. What an odd and disappointing situation. Does this limitation exist in the i5 and i7 Surface Pro 3s as well, or just the base i3 version? In any case, to the person originally asking about this, in that case I can't think of a way you could use this display at 60 Hz since you can't force an SST display into MST mode. MST mode requires that there be a second independent controller in the display itself, and given the amount of problems 4K MST has been causing on other displays, I'm sure Philips was happy to be able to get 4K @ 60 Hz over SST and not have to include MST at all.